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Karnataka Board PUCPUC Science 2nd PUC Class 12

PUC Science 2nd PUC Class 12 - Karnataka Board PUC Important Questions for Chemistry

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Chemistry
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Write the products formed when CH3CHO reacts with the following reagents : H2N – OH

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Concepts of Aldehydes, Ketones, and Carboxylic Acids >> Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions

Write the products formed when CH3CHO reacts with the following reagents: CH3CHO in the presence of dilute NaOH

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Concepts of Aldehydes, Ketones, and Carboxylic Acids >> Chemical Reactions of Aldehydes and Ketones - Reactions Due to α-hydrogen

Account for the following : Cl – CH2COOH is a stronger acid than CH3COOH.

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Acids >> Chemical Reactions of Carboxylic Acids - Substitution Reactions in the Hydrocarbon Part

Out of CH3CH2 – CO – CH2 – CH3 and CH3CH2 – CH2 – CO – CH3, which gives iodoform test?

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Concepts of Aldehydes, Ketones, and Carboxylic Acids >> Chemical Reactions of Aldehydes and Ketones - Oxidation

An organic compound (A) (molecular formula C8H16O2) was hydrolysed with dilute sulphuric acid to give a carboxylic acid (B) and an alcohol (C). Oxidation of (C) with chromic acid produced (B). (C) on dehydration gives but-1-ene. Write equations for the reactions involved.

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Acids >> Methods of Preparation of Carboxylic Acids

Give a simple chemical test to distinguish between the following pair of compounds:

Benzaldehyde and Acetophenone

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Concepts of Aldehydes, Ketones, and Carboxylic Acids >> Chemical Reactions of Aldehydes and Ketones - Oxidation

How will you bring about the following conversion in not more than two steps?

Ethanol to 3-Hydroxybutanal

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Concepts of Aldehydes, Ketones, and Carboxylic Acids >> Chemical Reactions of Aldehydes and Ketones - Reactions Due to α-hydrogen

Complete the synthesis by giving missing starting material, reagent or product.

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Preparation of Aldehydes and Ketones

Arrange the following: C2H5NH2, C2H5OH, (CH3)3N – in the increasing order of their boiling point

Appears in 3 question papers
Chapter: [9] Amines
Concept: Physical Properties of Amines

Write the structures of A, B and C in the following:

Appears in 3 question papers
Chapter: [9] Amines
Concept: Diazonium Salts >> Chemical Reaction of Diazonium Salts - Reactions Involving Displacement of Nitrogen

An aromatic compound 'A' of molecular formula C7H7ON undergoes a series of reactions as shown below. Write the structures of A, B, C, D and E in the following reactions :

Appears in 3 question papers
Chapter: [9] Amines
Concept: Preparation of Amines

Write the structures of main products when aniline reacts with the following reagents :

Br2 water

Appears in 3 question papers
Chapter: [9] Amines
Concept: Concept of Amines >> Chemical Reactions of Amines - Electrophilic Substitution

Write the structures of main products when aniline reacts with the following reagents : HCl

Appears in 3 question papers
Chapter: [9] Amines
Concept: Concept of Amines >> Chemical Reactions of Amines - Basic Character of Amines

Write the structures of main products when aniline reacts with the following reagents :

(CH3CO)2O/pyridine

Appears in 3 question papers
Chapter: [9] Amines
Concept: Concept of Amines >> Chemical Reactions of Amines - Electrophilic Substitution

Give a simple chemical test to distinguish between the following pair of compounds :

(CH3)2NH and (CH3)3N

Appears in 3 question papers
Chapter: [9] Amines
Concept: Concept of Amines >> Chemical Reactions of Amines - Reaction with Arylsulphonyl Chloride

The conversion of primary aromatic amines into diazonium salts is known as ___________

Appears in 3 question papers
Chapter: [9] Amines
Concept: Introduction of Diazonium Salts

Give the structures of A, B and C in the following reactions :

Appears in 3 question papers
Chapter: [9] Amines
Concept: Preparation of Amines

Give the structures of A, B and C in the following reactions :

Appears in 3 question papers
Chapter: [9] Amines
Concept: Preparation of Amines

Account for the following:

pKb of aniline is more than that of methylamine.

Appears in 3 question papers
Chapter: [9] Amines
Concept: Concept of Amines >> Nomenclature of Animes

How will you convert ethanoic acid into methanamine?

Appears in 3 question papers
Chapter: [9] Amines
Concept: Concept of Amines >> Nomenclature of Animes
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